Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-03-15
1990-12-04
Tung, T.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
2041809, 2041811, 2041815, 204 386, 505739, 505740, 505741, C25D 1302, H01L 3900
Patent
active
049754173
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a process for preparing an oxide-based superconductor, that can readily prepare superconductors with a variety of shapes.
BACKGROUND ART
In recent years, development of oxide-based superconductors has been energetically made, but, because of a poor processability of the oxide-based superconductors, it has become important to study how practically useful wires, thin films or sheet materials are to be prepared. Conventional methods of preparing superconductors include a sputtering process in which superconductor starting materials are fired and ground into powder, followed by press molding, and the resulting material is sputtered on a substrate; a screen printing process in which superconductor starting materials are fired, ground into powder, and thereafter kneaded into a paste, which is screen printed on a substrate; and a solvent coating process in which superconductor starting materials are fired, ground into powder, and thereafter dispersed in a solvent, which is coated on a substrate.
However, although the sputtering process can prepare superconductors with a uniform thickness regardless of the shape of the substrate, they are greatly affected by the properties of the substrate, at the same time resulting in compositional differences between sputtering materials and products, and also resulting in a poor continuous workability. On the other hand, the screen printing process or solvent coating process has no such problems, but can not yield superconductors with a uniform thickness if the substrate has irregularities, and also preliminary drying must be carried out to substantially completely remove the solvent in carrying out re-firing.
DISCLOSURE OF THE INVENTION
In the present invention, the superconductor is prepared by a process, comprising grinding a fired ceramics superconductive material into fine powder, suspending the powder in a solvent, and thereafter depositing the material on an electrode by an electrophoretic means, or again firing the material after deposition on the electrode, or covering with a metal the superconductor prepared by these procedures.
This invention is a process of preparing an oxide-based superconductor by an electrophoretic means, so that, even if a substrate has irregularities, grooves, holes or the like, the material can be deposited with a uniform thickness on those areas, there may be no dimensional limitations, and the thickness of superconductors can also be freely controlled. Also, the electrophoresis can be continuously operated if it is carried out according to methods such as wire plating, coil plating and barrel plating. Moreover, since the electrophoresis brings about electrodeposition of the suspended superconductive particles as they are, the superconductive material and a product can be made compositionally identical. Since also the particles in the solvent are deposited on a substrate by application of a voltage, there is given the same state as plating, and hence the particles can be closely adhered to the substrate, and the particles are also closely adhered between them. Therefore the superconductor prepared by utilizing electrophoresis is brought into almost the same state with a product obtained by press molding or more advantageously the same state with a product obtained by sintering.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a graph showing the relationship between applied voltages and quantities of electrodeposition of superconductors when electrolysis was carried out for 1 minutes after ultrasonic stirring; and
FIGS. 2 to 4 show characteristics of the superconductors prepared in Examples, in which FIG. 2 shows an X-ray diffraction pattern, FIG. 3, a graph to show a magnetic susceptibility, and FIG. 4, a graph of electrical resistivity, respectively.
BEST MODE FOR WORKING THE INVENTION
In preparing the superconductor in the present invention, similar to conventional methods, superconductor starting materials are first mixed in a given ratio, and the mixture is reacted by firing to make it in
REFERENCES:
patent: 2972570 (1961-02-01), Haas
patent: 3575838 (1971-04-01), Hughes
patent: 3841986 (1974-10-01), Rion
patent: 4085021 (1978-04-01), Van der Vliet
Hsing Ben C.
Nisshin Steel Company Limited
Tung T.
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